Fluid-operated percussive tool.



L C. BAYLES.

FLUID OPERATED PERCUSSIVE TOOL.

APPLICATION man JUNE 9.1914.

1. 3131 LQ -w, Patented 12111.2, 191?.

IA I/ENTOR gsl-uim Q (5 ATTORNEY EASION, PENNSYLVANZA, ASSIGNGB- T INGERSOLL-RAND ANY, 0E JERSEY CITY, NEW JERSEY, A CQEIPORATXON OF NEW] JERSEY.

LEWIS C. BJkYILES,

FLUID-OPERATED PERGUSSIVE TOOL.

Specification of Letters Patent.

Patented Jan. 2, 19.3%

Ap slieation filed June 9, 1914 Serial No. fiiSflZE.

"Hr oh ecx; of this invention to provide ith? valve for controlling the lClllllS- LU i v sic-n thud to one end or the cylinder to 1210" e 1 cf of the piston blow" s object ucconipiished by the invencal embodiment of which is the accompanying drawings, in

are iongitudinnl sections piston and the euxiiiary valve osi ions 7 shown a cylinder 1 sinelier rearward bore 2 forward bore 3, a piston 4 hehas a head 5 sliding in end a shank 6 sliding;

which i n and a large;-

prm'ided which 1 1 i forward bore 3 th 3@ in the rearward bore 3, there being neck 7 hetweeu the head and shank of th plston.

e Fluid admitted constantly to the rear end ot' the here 3 by a passage 8. From the forward end of the core 55 so placed as to into cor *nicution with the cud 3 by the neck '2' near the rear of piston stroke, e passage 8 leads end of the bore 53. rem a. port rearward part of bore u passage 10 leads to the forward of the bore 3.

control toe opening of the port 9 it valve 11 is provided which has e head 12 sliding in a valve chest 13 and a separate portion 1% projecting into the bore 10 and adapted in its forward position to close the port 9., the head 12 being provided with opposed ope-rating faces. To the rearward end of the velve chest 13 a passage 15 leads from 471% rearward. end of the bore 2 and to the orwerd end of the valve chest 13 a 5 leads from the bore 3 at such at point that he uncovered by the piston heed near the end or its stroke in both directions.

From the side of the here 2 an exhaust ssuge I1? ieeds to the atmosphere, it being so placed that it is uncovered my the rear face of the shank 6 near the end of the piston stroke while from the side of the bore 3 an exhaust passage 18 leads to atmosphere and is so placed as to he uncovered by the forwurdend of the piston head 5 near the end of the rearward stroke of the piston.

in operation, supposing the parts to be as shown in Fig. 2, fluid is being admitted to the rear end of the bore 3 and to the rear end of the bore 2 through the passage 8. With the piston in this position there will he pressure on the rearward face of the valve head 12 and no pressure on its forward surface so that the valve 11 will he in its most forward position, the controlling portion 14 closing the port 9. The pressure on the rearward surfaces of the piston will drive it forward, the fluid in the forward part of the bore- 3 exhausting "for a portion of the stroke through the port 18.

As the piston moves forwardly the shank (3 will cover the port- S the piston thereutter moving forward under the influence of the constant pressure on the rear face of the piston head and the expansion of the fluid in the bore. 2. As the piston moves forward the rerr face of the piston. head will uncover the port 9, but by reason of the valve 11 no fluid can pass through the port 9 to the forard end of the bore 3. When the piston however, reaches the position shown in Fig". i. the opening of the passage 16 will be uncorered allowing fluid to pass into the forward end of thevulve chest 13. At the same time the pressure in the rear end of the bore 2 will be exhausted through the opening of port h?! the forward movement of the shank 6. The valve 11 will, therefore, move reerwardly admitting fluid through the port 9 to the forward end of the bore 3. This will cause the piston to move rearwerdly until its movement is checked by the pressure on the rearward surfaces of the piston, the admission of fluid to the forward end heing cut oii when the piston head covers the port 9. VJ hen the piston'nesrs the end of its rearward stroke, the passage 16 will be opened to atmosphere through the port 18 and live nressure will again he admitted through the pussegefi to the rear end of the bore 2 and to the rear end of the valve chest 13 through the passage 15 with the resuit that the valve 11 will move forwardly again closing the port 9.

tie

. constantly to the rearward end of said larger cylinder portion, a passage controlled by the piston for admitting fiuid into the rearward end of the cylinder near the rearward end of the piston stroke, a passage for ad mitting fluid into the forward end of said cylinder, said passage having a' port uncovered by the piston, a valve controlling said till port, means formoving said valve to open said port near the end of the forward stroke of the piston, and means for moving said valve to close said port near the end of the rearward stroke of the piston.

2. In a fluid operated percussive tool, a cylinder having a rearward portion of smaller diameter and a forward portion of larger diameter, a piston havinga shank sliding in said rearward cylinder portion and a head sliding in said forward cylinder portion, said piston having two small surfaces for driving it forward and a large surface for driving it rearward, a fluid passage for admitting fluid to a port-ion of the cylinder to exert a constant pressure on one of said smaller surfaces, a passage controlled by the piston for admitting fluid to exert pressure on the other of said smaller surfaces near the end of the pistons rearward stroke, a passage to the forward end of the cy1inder and adapted t6 be put into communication with the constant pressure portion of the cylinder by the movement of said piston, a valve controlling said passage having a port controlling portion, and a separate 'opcrating portion having operating surfaces, a passage opened by the piston near the forward end of its forward stroke to convey fluid under pressure from the cylinder to an operating surface of said valve to move it der portion and a head sliding in said for-' ward cylinder portion, means for admitting fluid constantly to the rearward end of said larger cylinder portion, a passage controlled by said piston for admitting fluid into the rearward end of the cylinder near the rearward end of the piston stroke, a passage for admitting fluid into the forward end of said cylinder, said passage having a port uncovered by the piston, a valve for controlling said port having a port controlling portion and a separate operating portion having operating surfaces, a passage opened by'the piston near the forward end of its forward stroke to convey fluid under pressure from the cylinder to an operating surface of said valve to move it to open said port, and means to move said valve to close said port near the rearward end of thepiston stroke.

4. In a fluid operated percussive tool, a cylinder having two different diameters, apiston having a head sliding in the larger bore, a shank sliding in the smaller bore of said cylinder, and a neck connecting said head and shank, means for admitting fluid constantly to the end of the larger bore surrounding said neck, a passage controlled by the piston and operating in conjunction with said piston neck for admitting fluid from said end of the larger bore to the outer end of said smaller bore, a passage overrun by said piston head for admitting fluid from said end of the larger bore to the outer end of said larger bore, a valve controlling said port, and means for moving said valve to open said port when the plston reaches the end of its stroke toward the outer end of said larger bore.

In testimony whereof, I have hereunto set my hand.

LEWIS C. BAYLES.

Witnesses FRED. S. OvnR'roN, Orro W. HOLMGREN. 

